% xSpline.m
% 三次樣條插值例子
% 本程序演示函數spline()的用法
%
%   Author: HUANG Huajiang
%   Copyright 2003 UNILAB Research Center, 
%   East China University of Science and Technology, Shanghai, PRC
%   $Revision: 1.0 $  $Date: 2003/02/23 $

clear all
clc

% 已知離散點(x,y)
x = [2.5  2.6  2.7  2.8  2.9];
y = exp(x);

% 插值向量
xi = [2.55  2.63  2.77  2.86];

yi_spline = spline(x,y,xi)      % 三次樣條插值

y_true = exp(xi)                % 對應于插值向量的真實函數值